Inner tube for automobile-wheels.



D. W. HARRIS.

INNER TUBE FOR AUTOMOBILE WHEELS. APPLICATION FILED APR, 3, 1912.

- 1,047,803, Patented Dec. 17,1912.

WNW I WITNESSES INVENTOR nmu Dank] W Harris Mm W 192's Aliorngg I I r v I w v 7 7 I j v COLUMBIA PLANOGRAPH co..wAsmNu'r0N, n. c.

To all whom it may concern:

DANIEL HARRIS, F PLATTE CITY, MISSOURI.

INNER TUBE FOR AUTOMOBILE-WHEELS.

. Specification of Letters'Patent.

Patented Dec.-17,-1912.

Application fired April 3; 1912. -Seria1 No. 688,252. 7

Beit known that I, DANIEL W. HARRIS, a citizen of the United States, residing at Platte City, in the county of Platte and State of Missouri, have invented certain new and useful Improvements in Inner Tubes for Automobile-Wheels, of which the fol lowing is aspecification, reference being had therein to the accompanying drawing.

This invention relates to elastic inner tubes for tires, and has for its object the production of an efficient metallic inner tube which will readily yield when coming in .engagement with an obstruction.

Another object of this invention is the production of an efiicient metallic spring tire of the spiral typewhich will perform all of the functions of a pneumatic inner tube.

- spiral tube placed within the tire.

is a transverse section through the tire.

Wit-h these and other objects in View, this invention consists of certain novel constructions, combinations, and arrangements of parts, as will be hereinafter fully described and claimed.

In the drawings: Figure 1 is a central vertical section of the wheel showing the Fig. 2

By carefully considering Fig. 1, it will be seen that the resilient tube comprises a spiral structure having one convolution wound upon and seated upon the adjacent convolution so as to allow'the tube to yield as the tire passes over an obstruction.

'By carefully considering Fig. 2, it will be seen that the usual rim 1 is employed which rim is provided with a plurality of parallel circumferential grooves 2 in which grooves are seated the side edges of the first convolution or base convolution of the spiral tube structure 3. As stated above, one convolution of. the spiral inner tube is wound upon the adjacent convolution as illustrated in cross section in Fig. 2, and it will be seen that the side edges of the second convolution rest upon the bulged sides of the first convolution. The'side edges of the third convolution rest upon the bulged sides of the second convolution thereby allowing the respective convolutions of the spiral inner tube to readily yield one upon the other, both transversely and longitudinally. When constructing the spring inner tube, the second convolution extends down practically one-half an inch below the top j of the inner or first convolution, and the] thlrd convolut on in like manner overhangs Of course, when the second convolution. pressure is brought tobear uponthe tire the difierent spiral sections may telescope over each other and'lthereby force the side edges of one convolution for quite a distance upon the sides of the other convolution as illustrated clearly in Fig. It should be noted that when the spiral convolution is first wound that the sameis wound in the relation as justdescribed.

By carefully considering Figs. 1 and 2 it i will be seen that the outer casing 6 will be supported away from the rim 1 of the wheel and that the tire will not become flat should the outer casing 6 become perforated for the reason that the spiral tube structure 2 will at all times hold the casing in its proper position.

From the foregoing description it will be readily obviousthat a very eflicient and durable inner tube has been produced which may be made of very light material, and

while being formed of spring metal will form a very eflicient resilient means to take the place of the ordinary pneumatic tube now in use. Owing to the elasticity of the spring inner tube, it will be seen that the same will readily conform to the contour of the rim as well as to the outer tire tread. Furthermore, owing tothe fact that the side edges of the different convolutions are so mounted upon the adjacent convolutions the sides of the tire will be protected frombeing cut by the side edges of the several convolutions as is clearly illustrated in Fig. 2, owing to the fact that these ,side edges ofthe convolutions are spaced from the inner face: of the tire. i

What is claimed is I A devi'ce'of the class described comprising a rim having a plurality of parallel circum-' ing substantially circular in cross section,

the inner convolution of said spiral having f its side edges fitted within said grooves inn.

said rim. and the other convolutions of said spiral wound upon, the first convolution whereby the side edges of the second convolution will engage the bulged sides of the first convolution, and the side edges of the third convolution Will engage the bulged sides of the second convolution for efliciently holding the several convolutions in their respective operative positions.

In testimony whereof I hereunto afiix my signature in presence of two wltnesses.

DANIEL W. HARRIS.

Witnesses:

Jim. W. CARTER, DAVID DE BARD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). C. 

